Improvement in paint-mills



@einen tatrs ntwt @frn Letters Patent No. 76,386., dated April 7, 1868.

IMPROVEMENT ni PAINT-MILLS.

iln tlgrhirlr tefrmh tu im tlgrse ill-letters @anni ami mating pitt ni tigt sume.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, CHARLES BELCII'ER, of the city oi' Newark, in the county of Essex, and State oi' New Jersey, have made certain Improvements in Mills for Fine Grinding of Colors, Enamels, and all articles of that kind; and I do hereby declare the following to be a full andexact description of the same, reference being Aherein had to the drawings that accompany this specification, and make part of'the same.

It has been a great desideratum, not heretofore perfectly attained, to have a mill so constructed that the grinding-surfaces should preserve a face with the plane unalteredby the wear of its work. lThe need of a quickly-produced uniformity of lneness'in the material subjected to the grinding process, and of preventing' the waste of the very costly articles requiring .fine grinding for use in lche various arts, has not been fully met by any of thereally good mills in common use. 'llie improvement made ivill appearto be,but slight, although itsl effects are of great importance. It consists in so arranging or adapting two grinding-surfaces that the conA stant tendency of tl1eir.wear shall be to produce and preserve plane surfaces as'near to perfection as possible, the consequence being a uniformity in lineness in the material under process of disintegration, with less waste of stock than otherwise is attainable, much time being saved not only in grinding, but also in the time lost in correcting their regular grinding-surfaces caused by wear from use in all other mills.

These important results are attained by having two grinders, A andB, (in the drnwings,) A being about half the size of B, both revolving, A being made to cover tbeentire space between the centre and the circumference 4of the larger grinder, B, every portion ofthe entire surface ofA giving precisely the same amount of Fricftion to the whole of the face of B, rendering any inequality from Wear nearly or quite impossible. By means of the guide C, and the upward-projecting rim m, the material is confined to the grinding parts and place.

A spring, s, is placed over the top of the driving-shaft z' of the grinder A, that, by means of the thumbscrewlt, regulates `the pressure of the grinder A upon the material under process of' grinding. lhe drivingvshatt i is not fast to the grinder A, being loose, to allow of perfectly parallel contact ofthe faces ofthe grinders.

This mill being intended for the finer kind of material used in the line arts, is not confined to the use oi' any particular kind of grinders. Stone, porcelain, glass, or metal can be employed with the same results of uniform disintegration.

Motion is given by pulleys la, and belts g, Vas may be desirable. v, What I claim, and desire to secure by Letters Patent, is-e The two revolving grinders, A and B, the one about half the size of the other, when combined with the scraper C, arranged and operated relatively to each other, as above described, and for' the purpose set forth.

CHARLES BELG-HER.

Witnesses W. M. GooDINe, SIDNEY U. EDWARDS. 

